Michael Jackson's DocWANTED MAN

2/21/2013 11:00 AM PST

Michael Jackson's Doctor, Arnold Klein -- Arrest Warrant Issued

EXCLUSIVE

Dr. Arnold Klein, the dermatologist to the stars who was best friends with Michael Jackson and injected him with powerful drugs, has a warrant out for his arrest.

As you know, Klein has plummeted from grace after MJ's death. TMZ broke a number of stories, revealing that the Doc injected MJ with Demerol scores of times in the months leading to his death. He also used multiple aliases for MJ in prescribing meds.

Klein -- who has now filed for bankruptcy -- failed to turn over more than 100 pieces of wildly expensive artwork as well as a 2001 Ferrari Spider to the bankruptcy trustee.

The judge has now ordered the U.S. Marshals to arrest Klein and send him to the federal pokey until he turns over the goods.

As for the artwork, it includes pieces by Andy Warhol (including the famous Marilyn Monroe), Robert Graham, David Hockney, Roy Lichtenstein, Claes Oldenburg, Renoir, Rodin and Toulouse-Lautrec.